Bolle Vibe Sunglasses - TNS Lens They are light yet offer good shock resistance Sport and General purpose wear With a visible light transmission of 10 percent , they are ideal for sunny conditions Our lenses align light rays from the sun, giving you a crystal clear view at all times The only prescription program which ensures optimum precision, comfort and frame balance for sports sunglasses Our polarized lenses align light rays from the sun, giving you a crystal clear view at all times The only prescription program which ensures optimum precision, comfort and frame balance for sports sunglasses Our polycarbonate lenses are 20 times more impact resistant than glass and three times lighter